ASTE Atacama Submillimter Telescope Experiment Hajime Ezawa National Astronomical Observatory of...
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Transcript of ASTE Atacama Submillimter Telescope Experiment Hajime Ezawa National Astronomical Observatory of...
ASTE Atacama
Submillimter
Telescope
Experiment
Hajime EzawaNational Astronomical
Observatory of Japan
ASTE Team National Astronomical Observatory of Japan
The University of Tokyo (IoA & Dept. of Physics)
Nagoya University
Osaka-pref. University
Universidad de Chile
The ASTE Project
• Install and Operate a 10-m submillimeter telescope at the one of the best observing site in nothern Chile.
• Explore the southern sky with submillimeter waves
• On-site evaluation of methods & techniques for submm. obs.– High precision antenna, high sensitivity submm. RX– Remote operation system
• Provide opportunity for young students to study observation and instrumentation for submillimeter astronomy
The ASTE Site• Located at alt. 4,800 m in the Atacama desert in northern Chile
• CBI, APEX, NANTEN2, ALMA, RLT, …. in vicinity
Fabrication and installation
To Chile
Fabrication in San P. de Atacama↑
Jan.-Mar., 2002
Final Position
To 4,800 m telescope siteMarch, 2002
Initial installation in Nobeyama →
2000 - 2001
Telescope
SatelliteComunication
ObservingRoom
Generators & Fuel tanks
• Satellite telephone• Oxygen cylinders & compressors• Safety rules (ex. time limit)
Alt. 4,800 m = 570 hPaSafety equipments including
The Antenna (1)
• The Antenna:– 10 m diameter– Surface Accuracy < 20 m– Adjustable 205 Al panels– BUS of CFRP and Invar
• High accuracy encoder ~0.03” rms• Sub-reflector
– Mounted on Steward platform– Wobbling capability
• Optical telescope– Mounted on telescope structure
The Antenna (2)Telescope
TransmitterFor Holography
Current surface accuracy = 18.9 m r.m.s.
RelativePointing Accuracy1.2” for AZ, EL
Receivers & SpectrometerSIS heterodyne Receivers
Cartridge type RX (4 K)
345 GHz, 500 GHz, 800 GHz
Tsys = 200 K ! @ 345 GHz
CO(J=7-6) Ori-KLContinuum Receivers• 3-band bolometer mainly for antenn
a evaluation (350, 650, 850 GHz)• Submillimter Camera
array of SIS direct photon detectors
at 650 GHz (Matsuo et al. 2004)
345 GHz RX
Spectrometer Four XF type auto-corelators
1024 ch for 512 or 128 MHz BW Spectrometer
Sugimoto et al. 2004
Holography TX
Satellite Link 56~64 kbps
San Pedro de Atacama(Base Facility, 2400 m)
Power Generators
Telescope Site(Alt. 4800 m)
Santiago(U. de Chile)
Internet
Japan(NAOJ and Univ’s)
Operation & Control•Remote control through narrow band-width connection•Operation possible from multiple sites (incl. overseas)
Latest Results
CO(3-2) towards M83
5 ar
cmin
CS(7-6) towards NGC 3576Yamaguchi et al. 4.81
Muraoka et al. 4.51
Outflows from IRS 4
Hiramatsu et al. 4.30Cha MMS1
IRS 4
IRS 6
Summary• 10 m submillimeter telescope ASTE is now in operation at
Pampa la Bola• Antenna shows good specification including surface accur
acy of 18.9 m r.m.s.• Cartdridge type 345 RX realizing Tsys=200 K @ 345 GHz• Telescope is remote-controllable from multiple sites throug
h satellite connection and internet.• Following the evaluation phase, astronomical observation
has been performed since 2003.
Hiramatsu et al. (4.30) YSO-close-packed region Cederbald 110Mizuno et al. (4.48) Magellanic cloudsMoriguchi et al. (4.50) TeV Gamma-ray SNR G347.3-0.5Muraoka et al. (4.51) Disk region of the barred spiral galaxy M 83Yamaguchi et al. (4.81) Southern massive star-forming regions
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